fix: remove internal implementation details (Borg, lz4) from blog post and homepage

index.html

@@ -1256,7 +1256,7 @@
                             anytime from the dashboard with one click, perfect
                             for when you have an agent status that works
                             perfectly. Backups are kept for 7 days (daily) and 8
-                            weeks (weekly) using Borg's prune retention policy,
+                            weeks (weekly),
                             so older snapshots are automatically cleaned up.
                         </div>
                     </div>